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I have been working with Linux based systems since 2002. I hope the article published on this site will be useful to those new to server administration.

How to delete a file

How do I delete a file under Linux  operating system? To remove a file or directory in Linux use the rm command. rm command syntax rm (short for remove) is a Unix / Linux command which is used to delete files from a filesystem. Usually, on most filesystems, deleting a file requires write permission on the parent directory (and execute …

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Fixing time drift in the servers (syncing with time servers)

Sometimes the clock in the system may shows some drift ( lagging or leading) in time.  We can fix this by adjusting the tick rate in the server. 1. Compare the system time with that of any timeserver. You can use any of  the following command for this. rdate -p rdate.cpanel.net ;date OR rdate -p rdate.darkorb.net ;date Here rdate prints …

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Exim Error: Ratelimit database not available

If you find any of the following errors below in your /var/log/exim_mainlog log file. The fix below should resolve these errors 2013-12-22 03:16:00 Failed to get write lock for /var/spool/exim/db/ratelimit.lockfile: timed out 2013-12-22 03:16:00 H=[]:13468 temporarily rejected connection in "connect" ACL: ratelimit database not available To fix these error , the exim cache database on the server needs to be …

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Linux: Bash Find Matching All Dot Files

A dot-file is generally any file whose name begins with a full stop. In Linux it is also called as hidden file. How do I list all dot files in my home directory? You can use the ls command to list all dot files in your current directory:   ls .* Sample outputs: .bash_history .bash_profile .bashrc .lesshst .profile .viminfo .: …

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List of cPanel Default Ports

The cPanel/WHM is one of the best control panel in this field. The simplicity itself, is the important point for this control panel. We already discussed a lot of topics for cPanel. The installation steps are also quite simple. In computer networking, a port is a software construct serving as a communications endpoint in a computer’s host operating system. A …

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Install PNP4Nagios on Centos

The installation of PNP will be described in more detail. It is expected that nagios was compiled from source and is located in /usr/local/nagios. Attention: The description applies to the developer version PNP 0.6.0. Please note that PNP has to be configured after the installation. Make and more The installation of PNP is controlled by makefiles. The system is analyzed after invocation …

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How to Install and Configure maldet (Linux Malware Detect – LMD)

Maldet also known as Linux Malware Detect virus scanner for Linux. Linux Malware Detect (LMD) is a malware scanner for Linux released under the GNU GPLv2 license, that is designed around the threats faced in shared hosted environments. It uses threat data from network edge intrusion detection systems to extract malware that is actively being used in attacks and generates …

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